/* =====================
   CSS Custom Properties
   ===================== */
:root {
  --color-primary: #00a394;
  --color-primary-hover: #00857a;
  --color-primary-light: #e0f5f3;
  --color-error: #dc2626;
  --color-error-light: #fef2f2;
  --color-success: #00a394;
  --color-border: #d1d5db;
  --color-text: #111827;
  --color-text-muted: #6b7280;
  --color-bg: #f3f4f6;
  --color-card: #ffffff;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.08), 0 2px 4px -2px rgb(0 0 0 / 0.06);
  --transition: 0.15s ease;
}

/* =======
   Reset
   ======= */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

[hidden] {
  display: none !important;
}

/* =======
   Base
   ======= */
html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.5;
  min-height: 100dvh;
}

/* ========
   Layout
   ======== */
.page {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
}

/* ========
   Header
   ======== */
.header {
  background: #fff;
  border-bottom: 1px solid var(--color-border);
  padding: 1rem 1.25rem;
  text-align: center;
}

.logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.625rem;
}

.logo-svg {
  display: block;
  flex-shrink: 0;
}

.logo-text {
  font-family: 'Pulp', -apple-system, BlinkMacSystemFont, sans-serif;
  font-weight: 200;
  font-size: 1.5rem;
  letter-spacing: 0.03em;
  color: var(--color-primary);
  line-height: 1;
}

/* =============
   Welcome
   ============= */
.welcome {
  background: #f0f9f8;
  border-bottom: 1px solid #c8eae7;
  padding: 2rem 1.25rem;
  text-align: center;
}

.welcome-heading {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.01em;
  line-height: 1.3;
  margin-bottom: 0.75rem;
  max-width: 26rem;
  margin-left: auto;
  margin-right: auto;
}

.welcome-body {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.65;
  max-width: 26rem;
  margin: 0 auto;
}

/* ==============
   Instructions
   ============== */
.instructions {
  background: var(--color-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 1.5rem;
  margin-bottom: 1.25rem;
}

.instructions-title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 1.125rem;
}

.steps {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.step {
  display: flex;
  align-items: flex-start;
  gap: 0.875rem;
}

.step-badge {
  flex-shrink: 0;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-size: 0.875rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 0.0625rem;
}

.step-text {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.55;
  padding-top: 0.3125rem;
}

/* =============
   Disclaimer
   ============= */
.disclaimer {
  background: var(--color-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 1.5rem;
  margin-bottom: 1.25rem;
}

.disclaimer-title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 0.75rem;
}

.disclaimer-body {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* ==============
   Reward Section
   ============== */
.reward-section {
  background: var(--color-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 1.5rem;
  margin-bottom: 1.25rem;
}

.reward-section-title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 1rem;
}

/* =======
   Main
   ======= */
.main {
  flex: 1;
  padding: 1.5rem 1rem 3rem;
  max-width: 480px;
  width: 100%;
  margin: 0 auto;
}

/* =========
   Form Card
   ========= */
.form {
  background: var(--color-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* ===========
   Fieldsets
   =========== */
.fieldset {
  border: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.legend {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--color-text-muted);
  margin-bottom: 0.25rem;
  width: 100%;
}

/* =======
   Fields
   ======= */
.field {
  display: flex;
  flex-direction: column;
  gap: 0.3125rem;
}

.label {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text);
}

.required {
  color: var(--color-error);
  margin-left: 0.1rem;
}

.input {
  width: 100%;
  padding: 0.6875rem 0.875rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  color: var(--color-text);
  background: #fff;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
  -webkit-appearance: none;
  appearance: none;
}

.input::placeholder {
  color: #9ca3af;
}

.input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgb(0 163 148 / 0.15);
}

.input.is-error {
  border-color: var(--color-error);
  background: var(--color-error-light);
}

.input.is-valid {
  border-color: var(--color-success);
}

.error-msg {
  font-size: 0.8125rem;
  color: var(--color-error);
  min-height: 1rem;
  display: block;
}

/* =========
   Radios
   ========= */
.radio-group {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.radio-label {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.875rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
  position: relative;
}

.radio-label:hover {
  border-color: var(--color-primary);
  background: #f0fdf4;
}

.radio-label:has(.radio:checked) {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.radio {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.radio-custom {
  width: 1.125rem;
  height: 1.125rem;
  border: 2px solid var(--color-border);
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 0.1875rem;
  transition: border-color var(--transition);
  position: relative;
}

.radio-label:has(.radio:checked) .radio-custom {
  border-color: var(--color-primary);
}

.radio-label:has(.radio:checked) .radio-custom::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--color-primary);
}

.radio-text {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
  flex: 1;
}

.radio-text strong {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text);
}

.radio-text small {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  line-height: 1.4;
}

/* ==========
   Textarea
   ========== */
.textarea {
  resize: vertical;
  min-height: 5rem;
  line-height: 1.55;
}

/* ==========
   Checkbox
   ========== */
.terms-field {
  gap: 0.375rem;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
}

.checkbox {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.checkbox-custom {
  width: 1.125rem;
  height: 1.125rem;
  border: 2px solid var(--color-border);
  border-radius: 4px;
  flex-shrink: 0;
  transition: border-color var(--transition), background var(--transition);
  position: relative;
}

.checkbox-label:has(.checkbox:checked) .checkbox-custom {
  background: var(--color-primary);
  border-color: var(--color-primary);
}

.checkbox-label:has(.checkbox:checked) .checkbox-custom::after {
  content: '';
  position: absolute;
  top: 1px;
  left: 4px;
  width: 5px;
  height: 9px;
  border: 2px solid #fff;
  border-top: none;
  border-left: none;
  transform: rotate(45deg);
}

.checkbox-label:has(.checkbox:focus-visible) .checkbox-custom {
  box-shadow: 0 0 0 3px rgb(0 163 148 / 0.25);
  outline: none;
}

.terms-text {
  font-size: 0.9375rem;
  color: var(--color-text);
  line-height: 1.5;
}

.terms-link {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.terms-link:hover {
  color: var(--color-primary-hover);
}

/* =============
   Form Banner
   ============= */
.form-banner {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 500;
  line-height: 1.5;
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.form-banner:not([hidden]) {
  opacity: 1;
  transform: translateY(0);
}

.form-banner[hidden] {
  display: none;
}

.form-banner--success {
  background: #dcfce7;
  color: #15803d;
  border: 1px solid #bbf7d0;
}

.form-banner--error {
  background: var(--color-error-light);
  color: var(--color-error);
  border: 1px solid #fecaca;
}

/* ==============
   Submit Button
   ============== */
.btn-submit {
  width: 100%;
  padding: 0.875rem;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), opacity var(--transition), transform var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 3rem;
}

.submit-confirmation {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  line-height: 1.55;
  text-align: center;
}

.btn-submit:hover:not(:disabled) {
  background: var(--color-primary-hover);
}

.btn-submit:active:not(:disabled) {
  transform: translateY(1px);
}

.btn-submit:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

/* Spinner */
.btn-spinner {
  display: none;
  width: 1rem;
  height: 1rem;
  border: 2px solid rgba(255, 255, 255, 0.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

.btn-submit.is-loading .btn-spinner {
  display: block;
}

.btn-submit.is-loading .btn-text {
  opacity: 0.75;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* =============
   Success Card
   ============= */
.success-card {
  background: var(--color-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 2.5rem 1.5rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.success-card[hidden] {
  display: none;
}

.success-icon {
  width: 4rem;
  height: 4rem;
  background: var(--color-primary-light);
  color: var(--color-success);
  border-radius: 50%;
  font-size: 1.75rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.success-title {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-text);
}

.success-message {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  max-width: 22rem;
  line-height: 1.6;
}

.btn-secondary {
  margin-top: 0.5rem;
  padding: 0.6875rem 1.5rem;
  background: transparent;
  color: var(--color-primary);
  border: 1.5px solid var(--color-primary);
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}

.btn-secondary:hover {
  background: var(--color-primary-light);
}

/* ============
   Terms Page
   ============ */
.terms-card {
  background: var(--color-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.terms-meta {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 1rem;
}

.terms-section {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.terms-heading {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-primary);
}

.terms-subheading {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-text);
  margin-top: 1rem;
  margin-bottom: 0.5rem;
}

.terms-section p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

.terms-list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.terms-list li {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  padding-left: 1rem;
  position: relative;
  line-height: 1.6;
}

.terms-list li::before {
  content: '–';
  position: absolute;
  left: 0;
  color: var(--color-primary);
}

.back-link {
  display: inline-flex;
  align-items: center;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-primary);
  text-decoration: none;
  border-top: 1px solid var(--color-border);
  padding-top: 1.25rem;
  margin-top: 0.25rem;
  gap: 0.25rem;
}

.back-link:hover {
  color: var(--color-primary-hover);
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* ===========
   Responsive
   =========== */
@media (min-width: 480px) {
  .header {
    padding: 1.25rem 2rem;
  }

  .welcome {
    padding: 2.5rem 2rem;
  }

  .welcome-heading {
    font-size: 1.625rem;
  }

  .main {
    padding: 2rem 1rem 4rem;
  }

  .form,
  .terms-card {
    padding: 2rem;
  }
}